By Wm. Mueller - -
Ornithology, ecology, environmentalism, and our life in the natural world

Wednesday, August 24, 2016

Bank Swallow - how things have changed

Over the past 3 decades, Bank Swallow populations have declined in many areas, and some geographic areas have indeed seen dramatic declines. In several provinces in Canada, the species has declined by 90%, but declines are underway in the United States also. Here in WI, the contrast in the map from Atlas 1, to the current map (with only 2 years of atlas observations) clearly shows some change is occurring statewide: